A single-crystal lithium-rich manganese-based cathode material and its preparation method

By using a material dispersion method of wet ball milling and freeze drying, combined with a sintering process of slow heating and rapid cooling, the problem of size and morphology uniformity of single-crystal lithium-rich manganese-based cathode material was solved, thereby improving the capacity performance of the material.

CN120978000BActive Publication Date: 2026-05-26宁夏汉尧富锂科技有限责任公司 +1
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Patent Information

Application Number
CN202510816485.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2026-05-26
Estimated Expiration
2045-06-18

AI Technical Summary

Technical Problem

Existing preparation methods result in single-crystal lithium-rich manganese-based cathode materials with poor size and morphological uniformity, which affects the material's capacity utilization.

Method used

A material dispersion method combining wet ball milling and freeze drying, along with a slow heating rate and a rapid cooling rate, was used to prepare single-crystal lithium-rich manganese-based cathode materials through secondary sintering, thereby suppressing abnormal grain growth and agglomeration.

Benefits of technology

This ensures the consistency of the single-crystal morphology and size of the particles, improves the capacity utilization of the material, and avoids performance degradation caused by uneven sintering.

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Abstract

This invention belongs to the technical field of cathode materials for secondary batteries. More specifically, it relates to a single-crystal lithium-rich manganese-based cathode material and its preparation method. The specific preparation steps of this invention include: mixing the precursor, LiOH·2H2O, and H3BO3 in a molar ratio of 1:1.05:0.02, followed by wet ball milling to obtain ball milling material; calcining the ball milling material at 500-550℃ for 3-5 hours, then further heating to 850-880℃ and calcining for 8-10 hours, followed by cooling, discharge, and sieving to obtain primary sintered material; mixing the primary sintered material with anhydrous ethanol in a mass ratio of (4-5):1, followed by wet sand milling for 50-60 minutes, and freeze-drying to obtain sand milling material with a D50 of 1-2 μm; mixing the sand milling material with lithium carbonate in a mass ratio of 1:0.02-0.025, heating to 1000-1050℃ in an air atmosphere, sintering for 12-15 hours, cooling, and discharging to obtain single-crystal lithium-rich manganese-based cathode material.
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